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The authors wish to thank Comunidad de Madrid and European Structural Funds for their financial support to ALCCONES project (S2013/MAE-2985) and ACES2030-CM project (S2018/EMT-4319). C. M. Valverde-Pizarro thanks Comunidad de Madrid for the funding through the grant PEJD-2017-PRE/AMB-4390.

Analysis of institutional authors

Briones, LAuthorSanz, EAuthorEscola, JmCorresponding AuthorSanz, RCorresponding Author

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September 27, 2022
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Coating of Ca(OH)(2)/gamma-Al2O3 pellets with mesoporous Al2O3 and its application in thermochemical heat storage for CSP plants

Publicated to:Renewable Energy. 162 587-595 - 2020-12-01 162(), DOI: 10.1016/j.renene.2020.08.095

Authors: Valverde-Pizarro, C M; Briones, L; Sanz, E; Escola, J M; Sanz, R; Gonzalez-Aguilar, J; Romero, M

Affiliations

IMDEA Energy, High Temp Proc Unit, Avda Ramon Sagra 3, Madrid 28935, Spain - Author
Rey Juan Carlos Univ, Dept Chem & Environm Technol, C Tulipan S-N, Madrid 28933, Spain - Author
Rey Juan Carlos Univ, Dept Chem Energy & Mech Technol, C Tulipan S-N, Madrid 28933, Spain - Author

Abstract

Thermochemical heat storage using the Ca(OH)(2) dehydration/hydration reaction for CSP plants requires the development of advanced materials that avoids the breakage shown by conventional CaO pellets. In this work, spherical cores made up of pelletized 60 wt % Ca(OH)(2) and 40% gamma-Al2O3 powders were coated with different mesoporous alumina coverings by means of a dip-coating route, in order to enhance its structural integrity for dehydration/hydration cycles. Three strategies of preparation were devised using as coatings alumina gels containing cetyltrimethylammonium bromide as surfactant in neutral (A2 CS) and acid pH (A4 CS) and without surfactant in neutral medium (A3 CS). In both A2 CS and A4 CS materials, denser alumina coatings were attained originating higher crushing strengths, pointing out the positive role played by the surfactant in the gel makeup. SEM images indicated that A2 presented small alumina grains (0.3-3 mm) highly dispersed over their surface, while over A4 CS, long sheets were appreciated. All the materials exhibited high hydration capacities after 10 cycles (>80%, >800 kJ/kg) at 250 Alpha C, but only A2 CS hold its structural integrity that was preserved even after 20 cycles without loss of its hydration capacity. (C) 2020 Elsevier Ltd. All rights reserved.

Keywords

?-al2o3Advanced materialsAluminaAlumina coatingAluminum oxideCa(oh)(2)Ca(oh)2Calcium hydroxideCalcium oxideCetyl trimethyl ammonium bromidesCoatingCoatingsDehydrationEnergy-storageFluidized-bed reactorGamma-al2o3Heat storageHeatingHydrated limeHydrationHydration capacityInorganic compoundIts applicationsMesoporous al2o3Mesoporous aluminaOxidePartPelletizingPower plantRehydrationStructural integritySurface active agentsTemperature effectThermo-chemical heat storagesThermochemistryValidation

Quality index

Bibliometric impact. Analysis of the contribution and dissemination channel

The work has been published in the journal Renewable Energy due to its progression and the good impact it has achieved in recent years, according to the agency WoS (JCR), it has become a reference in its field. In the year of publication of the work, 2020, it was in position 16/114, thus managing to position itself as a Q1 (Primer Cuartil), in the category Energy & Fuels.

From a relative perspective, and based on the normalized impact indicator calculated from the Field Citation Ratio (FCR) of the Dimensions source, it yields a value of: 4.36, which indicates that, compared to works in the same discipline and in the same year of publication, it ranks as a work cited above average. (source consulted: Dimensions Aug 2025)

Specifically, and according to different indexing agencies, this work has accumulated citations as of 2025-08-02, the following number of citations:

  • WoS: 18
  • Scopus: 20

Impact and social visibility

From the perspective of influence or social adoption, and based on metrics associated with mentions and interactions provided by agencies specializing in calculating the so-called "Alternative or Social Metrics," we can highlight as of 2025-08-02:

  • The use of this contribution in bookmarks, code forks, additions to favorite lists for recurrent reading, as well as general views, indicates that someone is using the publication as a basis for their current work. This may be a notable indicator of future more formal and academic citations. This claim is supported by the result of the "Capture" indicator, which yields a total of: 25 (PlumX).

It is essential to present evidence supporting full alignment with institutional principles and guidelines on Open Science and the Conservation and Dissemination of Intellectual Heritage. A clear example of this is:

  • The work has been submitted to a journal whose editorial policy allows open Open Access publication.

Leadership analysis of institutional authors

There is a significant leadership presence as some of the institution’s authors appear as the first or last signer, detailed as follows: First Author () .

the authors responsible for correspondence tasks have been Escola Sáez, José María and Sanz Martín, Raúl.